SHIP-SHIP HYDRODYNAMIC INTERACTION IN CONFINED WATERS WITH COMPLEX BOUNDARIES BY A PANELLED MOVING PATCH METHOD

2021 ◽  
Vol 158 (A1) ◽  
Author(s):  
X-Q Zhou ◽  
S Sutulo ◽  
C Guedes Soares
Keyword(s):  
Shallow Water ◽  
Satisfactory Agreement ◽  
Potential Flow ◽  
Hydrodynamic Interaction ◽  
Mirror Image ◽  
Ship Hulls ◽  
Seabed Topography ◽  
Image Technique ◽  
Ship Hydrodynamic ◽  
Complex Boundaries

This paper presents a potential flow solution for online estimation of hydrodynamic interaction between ships moving in restricted waters with complex boundaries. Each ship in concern is linked with a moving patch representing the arbitrary bathymetry beneath it. The wetted surfaces of ship hulls are meshed and loaded prior to the simulation, while the moving patches are dynamically discretized by a fast and robust mesh generator. The proposed method is validated for the ship- ship interaction case in the shallow water case with a flat and horizontal seabed where the mirror image technique is applicable, and satisfactory agreement is obtained. The method is further applied to simulate two interaction scenarios involving arbitrary seabed topography, and the numerical results are obtained and discussed.

A Numerical Method for Calculation of Ship–Ship Hydrodynamics Interaction in Shallow Water Accounting for Sinkage and Trim

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Huilong Ren ◽  
Chen Xu ◽  
Xueqian Zhou ◽  
Serge Sutulo ◽  
Carlos Guedes Soares
Keyword(s):  
Shallow Water ◽  
Hydrodynamic Interaction ◽  
Mirror Image ◽  
Image Method ◽  
Interaction Forces ◽  
Ship Hydrodynamics ◽  
Time Simulation ◽  
Water Accounting ◽  
Ship Hydrodynamic ◽  
Sinkage And Trim

Abstract Sinkage and trim, which often occur to ships moving in shallow water, do not only have an effect on the ship–ship hydrodynamic interaction forces but also increase the risk of grounding. Potential flow-based online calculation of ship–ship hydrodynamic interaction forces without accounting for dynamic sinkage and trim is able to capture the hydrodynamic interaction effects with fair accuracy; however, there are still discrepancies in many cases, especially in the case of shallow water. An algorithm based on the potential theory has been devised for real-time simulation of the hydrodynamic interaction between two ships in shallow water accounting for sinkage and trim. The shallow water condition is modeled using the mirror image method. The sinkage and trim are solved iteratively based on the principle of hydrodynamic balance, where a mesh trimming procedure is carried out when the waterline is changed. Simulations are performed with and without accounting for the sinkage and trim, and comparison with experimental results shows a fair agreement.

A Numerical Method for Calculation of Ship-Ship Hydrodynamics Interaction in Shallow Water Accounting for Sinkage and Trim

2019 ◽  
Author(s):  
Huilong Ren ◽  
Chen Xu ◽  
Xueqian Zhou ◽  
Serge Sutulo ◽  
Carlos Guedes Soares
Keyword(s):  
Shallow Water ◽  
Hydrodynamic Interaction ◽  
Mirror Image ◽  
Image Method ◽  
Interaction Forces ◽  
Time Simulation ◽  
Water Accounting ◽  
Ship Hydrodynamic ◽  
Sinkage And Trim ◽  
Hydrostatic Balance

Abstract Sinkage and trim, which often occur to ships moving in shallow water, do not only have an effect on the ship-ship hydrodynamic interaction forces, but also increase the risk of grounding. An algorithm based on the potential theory has been devised for real-time simulation of the hydrodynamic interaction between two ships in shallow water accounting for sinkage and trim. The shallow water condition is modeled using the mirror image method; while the sinkage and trim are solved iteratively based on the principle of hydrostatic balance, where a mesh trimming procedure is performed when the waterline is changed. Simulations are performed with and without accounting for the sinkage and trim, and comparison with experimental results shows a fair agreement.

Computation of Ship-to-Ship Interaction Forces by a 3D Potential Flow Panel Method in Finite Water Depth

2010 ◽  
Author(s):  
Xueqian Zhou ◽  
Serge Sutulo ◽  
C. Guedes Soares
Keyword(s):  
Water Depth ◽  
Potential Flow ◽  
Hydrodynamic Interaction ◽  
Single Layer ◽  
Mirror Image ◽  
Present Contribution ◽  
Interaction Forces ◽  
Sea Bottom ◽  
Close Proximity ◽  
Finite Water Depth

The double-body 3D potential flow code developed earlier for computing hydrodynamic interaction forces and moments acting on the hulls of the ships sailing in close proximity with neighbouring ships or some other obstacles, is extended to the shallow water case. Two methods for accounting for the finite water depth were implemented: use of truncated mirror image series, and distribution of an additional single layer of sources on parts of the seabed beneath the moving hulls. While the first method does only apply to the flat horizontal seabed, the second one can also deal with the arbitrary bathymetry situations. As appropriate choice of the discretization parameters can significantly affect the accuracy and efficiency of the second method, the present contribution focuses on comparative computations aiming at defining reasonable dimensions of the moving panelled area on the sea bottom and maximum admissible size of the bottom panel. As result, conclusions concerning optimal parameters of the additional set of panels are drawn.

Bank effects on ship–ship hydrodynamic interaction in shallow water based on high-order panel method

2017 ◽  
Vol 12 (6) ◽  
pp. 843-861 ◽  
Author(s):  
Hua-fu Xu ◽  
Zao-jian Zou ◽  
Si-wei Wu ◽  
Xiao-yan Liu ◽  
Lu Zou
Keyword(s):  
Shallow Water ◽  
Hydrodynamic Interaction ◽  
High Order ◽  
Panel Method ◽  
Water Based ◽  
Ship Hydrodynamic ◽  
Bank Effects

Investigation of Sinkage and Trim by Ships in Shallow Water Based on Overset Grid

2015 ◽  
Vol 713-715 ◽  
pp. 2126-2132
Author(s):  
Da Ming Sun ◽  
Ji Yong Liu ◽  
Qing Wen Kong
Keyword(s):  
Shallow Water ◽  
Equations Of Motion ◽  
Navier Stokes ◽  
Overset Grid ◽  
Ship Hulls ◽  
Surface Ship ◽  
Solving Equations ◽  
Sinkage And Trim ◽  
Volume Method ◽  
Good Agreement

A study on the navigation behavior for ships in shallow water had been carried out on CFD. The problem of surface ship hulls free of sinkage and trim in shallow water is analyzed numerically by simultaneously solving equations of the Reynolds averaged Navier-Stokes (RANS). The computations, based on the single-phase level set and overset grid, are discretized by finite volume method (FVM). An earth-based reference system is used for the solution to the fluid flow, while a ship-based reference is used to compute the rigid-body equations of motion. A S60 CB=0.6 ship model is taken as an example to the numerical simulation. Numerical results of the sinkage and trim of the seven Froude Numbers (Fn=0.5~0.8) are compared against experimental data, which have a good agreement.

CFD Analysis of Ship-to-Ship Hydrodynamic Interaction

2018 ◽  
Vol 17 (1) ◽  
pp. 21-37 ◽  
Author(s):  
A. D. Wnęk ◽  
Serge Sutulo ◽  
C. Guedes Soares
Keyword(s):  
Hydrodynamic Interaction ◽  
Cfd Analysis ◽  
Ship Hydrodynamic
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